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$
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I will build custom full stack apps with complex logic and legacy migration
Andres Garcia
About this gig
I engineer high-performance web and desktop apps from scratch no templates, no drag-and-drop builders. Every architecture is custom-coded in TypeScript around your real business logic.
My background in Nutrition & Dietetics means I can read a physiological or mathematical model and actually implement it correctly, not approximate it.
Recent technical work:
- Migrated a 1998 C engine into an isomorphic TypeScript/Electron app, with automated parity testing and a custom formula evaluator.
- Built a nutrition/hydration platform using peer-reviewed models (Yamada et al. 2022) with live weather-adjusted calculations.
- Built a content platform with a custom Markdown engine, hierarchical CMS, and GSAP/Three.js interactive UI.
Stack: React, Next.js, Node/NestJS, TypeScript, Electron, SQL.
What you get:
- Tiered delivery from a focused single-page build to a fully interactive, admin-managed platform
- Optional add-ons: an animated interactive mascot, or an original custom soundtrack
Message me before ordering so we scope it right.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Andres Garcia
Andres Garcia
Nutrition and Health Tech Developer, Custom Web and App Solutions
- FromColombia
- Member sinceAug 2026
- Avg. response time1 hour
Languages
Spanish, English, Russian
I design and build full custom web and PWA apps — frontend, backend, and data model, no templates. My background in Clinical Nutrition & Dietetics shows up directly in the apps I build: nutrition tracking systems with clinically accurate energy and hydration calculations, not generic dashboards.
FAQ
Do you build with WordPress, Shopify, or a website builder?
No — everything is custom-coded from scratch (React, Next.js, Node/NestJS). You get real, fully-owned source code, not a builder account you're locked into.
What do "unlimited revisions" actually cover?
Unlimited fixes and adjustments within the scope we agreed on at the start. Adding new pages or features that weren't part of the original brief counts as a scope change and gets quoted separately, so there are no surprises for either of us.
What happens if something breaks after delivery?
I cover free bug fixes for 15 days after delivery. Ongoing maintenance or new features after that can be arranged as a separate, small monthly plan.
What do you need from me to get started?
Your content (text, images) and a short description of what the site or app needs to do. For Standard/Premium, we'll also scope any specific integrations together before I start.
